Composition for rendering cardboard, &amp;c., impervious to grease.



COMPOSITIONS, COATlNG OR PLASTIC.

UN 1111.1) D'lfA'llib PATENT OFFICE.

NORMAN V. RANDOLPH, OF RICHMOND, VIRGINIA, ASSIGNOR- TO THE RANDOLPHPAPER BOX 00., OF SAME PLACE.

COMPOSITION FOR RENDERING CARDBOARD, &c., IMPERVIOUS TO GREASE.

SPECIFICATION forming part of Letters Patent No. 668,565, dated February19, 1901.

Application filed November 14, 1900- Serial No. 36,524- (No specimens)To a]? whom it 71211.7,- concern:

Be it. known that I, NORMAN V. RANDOLPH, a citizen of the United States,residing at Richmond, in the county of Henrico and State of Virginia,have invented certain new and useful Improvements in a Composition forRendering Paper, Cardboard, Thin Wood, and the Like impervious toGrease; and I do hereby declare the followingto be a full, clear, andexact. description of the invent-ion, such as will enable others skilledin the art. to which it appertains to make and use the same.

lily invention relates to a composition for rendering paper, cardboard,and the like impervious to grease; and it consists in bringing togethercertain ingredients in a proper manner, whereby a paste preparation isproduced which can be readily applied by brush or otherwise to thesurface of the paper or cardboard before the latter has been shaped toform any desired article or after an article has been produced from suchmaterial and when applied will render the paper or board impervious togrease.

The composition consists of the following ingredients, combined in aboutthe proportions stated to produce a given quantity of the composition,viz: silicate of soda, eleven pounds; mica one-fourti pound; glycerin,ten ounces; refcrabl brown sugar, one-lourt-h poun' riceom ounces;gum-arabic,fourounces; re ared ch two ounces. t

I first take the silicate of soda, mica, and lycerin andmixTliel'n'thol-oughlyfigether in a suitable vessel, and then add thebrown gg, (which has previously been dissolved nT'water, preferably hotwater) ice-flog, (also dissolved in water,i um-arabic, which has beenreduced to a thnftifimuwntb hot water,) and the prepared chalk. I findthat by carrying out this metlibTl th ingredients are moresatisfactorily brought together and the best results are obtained. I donot, however, wish to limit my invention to this exact manner of mixingthe ingredients.

The glycerin, brown sugar, and prepared chalk are used in thepreparation for the purpose of making the same pliable when in liquidform. The rice-flour and prepared chalk are for the purpose of making asmooth soft surface and also to prevent the paste from being too dark.The silicate of soda alone,

while being the largest component part, is of little value without theother ingredients, for when employed without said ingredients it cracksto such an extent when it dries as to render it useless as a coating forgrease-proof paper. \Vhen the paste has been thoroughly mixed anddissolved according to the above formula, it is preferably spread uponthe paper or board with a line brush and allowed to dry, and the paperis then ready for use.

I do not wish to limit my invention to the exact proportions named, assome material will require a thicker paste than others, and consequentlythe proportions will have to be varied coordingiy. The proportions givenare adapted to produce a paste of the proper consistency for generalapplication, though it may be made a little thicker or a little thinnerby adding more or less of some of the ingredients. 7

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is

l. A composition for rendering paper, cardboard, and the like imperviousto grease, which consi "-s of silicate of soda, mica, glycerin, sugar,rice-flour, gum-arabic and prepared ,chalk mixed together in about theproportiops set forth, substantially as described.

2. Acompositiou for rendering paper, cardboard," and the like,impervious to grease, which consists of silicate of soda, eleven pounds,mica, one-fourth pound, glycerin, ten ounces, brown sugar, one-fourthpound, ricefiour, four ounces, gum-arabic, four ounces, and preparedchalk two ounces, substantially as described.

3. The process of producing a composition for rendering paper, cardboardand the like impervious to g ease, which consists in mixing silicate ofsoda, mica and glycerin together, and then adding dissolved brown sugar,dissolved rice-flour and dissolved gumarabic and prepared chalk,substantially as described.

In testimony whereof I hereunto afiix my signature in presence of twowitnesses.

NORMAN V. RANDOLPH.

Witnesses:

Gno. WATT, P. G. Sownas.

